Slide-rule.



A. N. LURIE. SLIDE RULE. APPLICATION FILED APR. 25, 1910f Pagented June4, 1912.

L 02917 J Z Z film-e6,

UNITED STATES PATENT OFFICE. A

ARNOLD N. LURIlIE, OF CHICAGO, ILLINOIS,

LURIE, OF CHICAGO, ILLINOIS.

ASSIGNOR or oNE-HAILF To 'rnn'nnsa' n.

SLIDE-RULE.

Specification of Letters Patent.

Application filed April 25, 1910. Serial No. 558,089.

To all whom it may concern."

Be it known that I, ARNOLD N. LURIE, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Slide-Rule, of which the following "is aspecification.

My invention relates to slide rules provided with a runner carrying ahair line and the objects of my im )rovements are, first, to simplifythe gra nations on the scale; second to enable more accurate reading onthe scale; third, to make a cheaper and more desirable article and otherfeatures to become apparent from the description to follow. I

In slide rules the 'hair line on the runner glass is used to determinethe relative position of the graduations on the dill'ercnl portions ofthe rule, and as heretofore made the division lilies on the sections ofthc rulc were parallel to the hair line on the runner which madeaccurate reading very difficult or even i n ossible in certain parts ofthe rule.

fly the use of my invention the number of graduation lines on thedifferent sections of the rule are diminished and more accurate readingof the scale is afforded.

My invention consists of providing a slide rule with the necessary majorperpendicular graduation lines and connecting these lines by inclined ordiagonal lines and placing on the runner glass horizontal graduationlines -to cotiperate with the inclined and perpendicular lines. .Theconstruction may be modified by omitting the perpendicularlines, andeach inclined or diagonal line may be made to represent a logarithmicline.

To describe my invention so that others versed in the art to which itpertains may make and use the same, I have illustrated it 1 on theaccompanying sheet of drawing forming a part 0 this specification inwhich Figure 1, is a fragmentary face view of a slide rule embodying myinvention and Fig. 2, is a detail view showing a modification.

Similar reference characters refer to simi lar parts throughout.

The rule comprises the body portion 3, provided with a centrallongitudinal groove 4, in which the slide 5 is mounted to slidelongitudinally and 'the runner 6 is .mounted to slide on the bodyportion 3 with its glass 7 provided with the hair line 8 arranged to lieclose to the graduated surfaces of, the

rule 3 and slide 5.

The rufle is provided with the graduated, scales 9, 1'0, 11 and 12generally known as I scales A, B; C, and D, respectively, and

since each one of these scales is arranged like the others in so far asthe novelty of.

the invention is concerned I will proceed. to

runner 6 which is also perpendicular has a portion equal in length tothe length of the lines 13 divided into an equal numbcr of di-;

horizontal lines 15.

As clearly seen in the drawing the lines 15 on the runner 6 cooperatewith the diagvisions. prefcrablv ten indicated by the short onal lines14 on the scale, and since the dis-; tance from one line 15 to anotherline-15f indicates a tenth of the whole. the operator by observing whichline 15 crosses the inclined line 14 at the hair line 3, can readilyread how many tenths'to add to the amount indicated by the major line13. For example. when the runner (i and the slide 5 are in the positionshown in Fig. 1, the hair line 8 is seven and nine tenths tenths thedistance from the first line 13 to the left of same toward the firstline ill to the right of same on the scale 9: the hair line 8 is seventenths the distance from the first line 13 to the left of same towardthe first line 13 to the right of same on the scale 10; the hair linc Sis eight and tour tenths tenths the distance from the first line 13 tothe left of same toward the first line-13 to the right of same on scale11 and the hairline 8 is six and seven tenths tenths the distance fromthe first line 13 to the left of same toward the first line l3 tothe-right of same on scale 12.

In Fig. l, the diagonal lines ll are all shown as inclined in the samedirection but they may alternately be inclined in opposite directionswithout in the least departing from the spirit of my invention as shownin Fig. 2, where only the diagonal lines 16 and 17 are provided. Thevertical lines are omitted but the apexes formed by the junction of twolines 16 and 17 indicate the major divisions on the scale.

.To adjust the glass 7 in the runner 16 I provide the two set screws 18at the top edge of the runner 6 and the one set screw 19 at athe loweredge of the same to be screwed t-i htly against the edges of the glass7.

ilaving thus fully described my invention what I claim as new anddesire'to secure by Letters Patent of the United States is 1. In adevice of the class described, a

scale having designated points along an upper line and a lower line toindicate the major divisions of said scale, diagonal lines connectingthe designated points along the upper line with the designated pointsalong the lower line, a runner to slide longitudinally along said scaleand a vertical line on said runner divided into a plurality of equaldivisions to cooperate with said diagonal lines.

2. In a slide rule, a scale having vertical lines of uniform length toindicate the major divisions of said scale, diagonal lines connectingthe upper and lower ends of said vertical lines, a runner to slidelongitudinally along said scale and a vertical line on said runner equalin length to the vertical lines of said scale and divided into aplurality of equal divisions. In testimony whereof I have signed my nameto this specification in presenpe of two subscribing witnesses this 14thday of August 1909 at Chicago, Illinois.

ARNOLD N. LURIE.

Witnesses:

R. J. J ACKJER, WALTER A. WEI'SNER.

